In this study, we show that SNAI2, a mediator of EMT highly expressed in triple-negative breast cancer [26], is upregulated in endocrine-resistant cells, whereas other EMT-associated transcription factors, such as SNAI1/3, TWIST1/2, ZEB1/2, FOXC2, and GSC, are unaltered. This evidence concerns the gene SNAI2 and triple-negative breast carcinoma.